Do you use a resistor in series with your RESET line from the ISP to pin4?If you do, remove it (or maybe use a lower value). I did and everything seems to work again.(I still use 10K resistors in line with the MOSI, MISO, CSK pins)

Ive got a first version of a bootloader working.Using Bohne's asm serial and aziemer 256 word asm bootloader.

But when i have uploaded a sketch the bootloader is gone.The attiny84 doesnt have a bootloader section in the fuses to protect it.So the bootloader has to fix that. But my asm skill are none existing.Im already happy to incorporate the asm serial. Looks like the bootloader is still 256 words (512 bytes) as the arduino bootloader is 2048 bytes

I have mailed the author of the 256 word bootloader if he can help me out.Or maybe Bohne can help with this.

I see that there is now an attiny84 core for the arduino-0018 IDE. Has anyone created a core for the attinyx5 devices (specifically the attiny85)? That comes in a nice 8-pin DIP/SOIC and would be great for simple designs. Thanks!

so, I wonder if we could set up something in the playground with the cores, board files, schematics and examples. Can we host things there or just point to them - I don't have a hosting service anywhere or i would offer.

For the core files, I'd REALLY prefer they were hosted in the same way the Arduino core is hosted: Google Code. The Arduino download is even hosted there: http://arduino.[glow]googlecode[/glow].com/files/arduino-0019.zip .

I have a small window of time available right now. My (overambitious) plan is to...

Carefully review and test R.Wiersma's last known ATtiny84 core fixing any problems I find